The proposition made earlier that there exists a basic nonelectromagnetic interaction at the level of electromagnetism, which violates isospin, $C$, $\mathrm{CP}$, and $T$ invariance "maximally," is reconsidered. It is found that the notion of this new interaction acquires several desirable features in the framework of the three-triplet model. They are: (a) the construction of partially conserved $\Delta S=\Delta Q=0\mathrm{}$, $C$-even and $C$-odd vector currents entering into the interaction; (b) the suppression of $\mathrm{CP}$ violation relative to isospin violation due to the new interaction; and (c) the possibility of a large contribution from the new interaction to the $\Delta I=1\mathrm{}$ mass differences without an appreciable contribution to the $\Delta I=2\mathrm{}$ mass differences. The $\eta \to 3\pi$ problem does not seem to have any simple solution in the present model if we insist on a vector form for the new interaction. The possible advantages of a scalar form for the above interaction with respect to the $\eta \to 3\pi$ decay and the signs of the $\Delta I=1\mathrm{}$ mass differences are noted. Regardless of the vector or scalar form for the interaction, the suppression of $\mathrm{CP}$ and $T$ violation in the present model will have the consequences that the asymmetry parameter for the $\eta \to {\pi }^{+}+{\pi }^{-}+{\pi }^0$ decay should be of the order of ½% and that the electric dipole moment of the neutron should lie in the region of ${10}^{-23\mathrm{}}$-${10}^{-24\mathrm{}}$ e cm, both of which estimates are an order of magnitude lower than the previous ones. It is emphasized that in addition to the above measurements, a search for the vector meson $V^0$ or alternatively the scalar meson $S^0$ (which mediates the new interaction) in the two-pion mass spectra would be most desirable to judge the existence of the new interaction.

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